But as Doc Rivers famously told everyone, it's too early to write the obituary, and Rivers has largely been proved right, as the Celtics have gone 14-5 in Rondo's absence, with numbers that would suggest they are doing more than just surviving without him, as Kevin Pelton outlined recently. Why? The Celtics' system, not to mention their roster, has allowed them to compensate for the loss of their point guard. Other teams, however, wouldn't be so lucky. So who are the most important point guards in the league? Meaning: Which five are simply indispensible to their teams?